I have seen that if you use the ‘Add to cart’ rollover on products it adds two products rather than one to the cart. According to Woocommerce this happens when there are any empty background-image (css) properties, or img and link tags with empty src/href attributes – (it causes page to reload). I have checked and can’t see any of these – I wondered if you had had any other reports of this or knew where to look exactly.
The URL for the page is http://www.gallucciandgilmour.com/products/
Wordpress:3.8.1
Theme: 1.7.5
Shortcodes: 2.0.4
woocommerce: 2.1.5
many thanks